This changes the database to use sha1 based file names. Its not
beautiful, but this is the BS we have to do to cope with the garbage
that is case insensitive filesystems.
Legacy databases are still honored, if you have them.
We add st, st-meta, and the -256color and -truecolor variants.
Note that the -truecolor variant was NOT described in the st.info
file, but st uses the same color escapes that everyone else does
for 24-bit color.
